package com.common.utils;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import com.common.crash.CrashActivity;

import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class CrashHandler implements UncaughtExceptionHandler {

    public static final String TAG = "CrashHandler";

    // 系统默认的UncaughtException处理类
    private UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();

    private List<Activity> mActivities = new ArrayList<>();

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        if (INSTANCE == null) {
            INSTANCE = new CrashHandler();
        }
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context) {
        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
        if (context instanceof android.app.Application) {
            ((android.app.Application) context).registerActivityLifecycleCallbacks(new android.app.Application.ActivityLifecycleCallbacks() {
                @Override
                public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
                    mActivities.add(activity);
                }

                @Override
                public void onActivityStarted(Activity activity) {
                }

                @Override
                public void onActivityResumed(Activity activity) {
                }

                @Override
                public void onActivityPaused(Activity activity) {
                }

                @Override
                public void onActivityStopped(Activity activity) {
                }

                @Override
                public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
                }

                @Override
                public void onActivityDestroyed(Activity activity) {
                    mActivities.remove(activity);
                }
            });
        }
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
            // 退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                StringBuilder errorMessage = new StringBuilder();
                errorMessage.append("应用发生异常,即将退出：\n");
                errorMessage.append(ex.toString());
                for (StackTraceElement element : ex.getStackTrace()) {
                    errorMessage.append("\n").append(element.toString());
                }
                Activity currentActivity = getTopActivity();
                if (currentActivity != null && !currentActivity.isFinishing() && !currentActivity.isDestroyed()) {


                    Intent intent = new Intent(currentActivity, CrashActivity.class);
                    intent.putExtra("errorMessage", errorMessage.toString());
                    currentActivity.startActivity(intent);

//                    AlertDialog.Builder builder = new AlertDialog.Builder(currentActivity);
//                    builder.setTitle("错误提示")
//                            .setMessage(errorMessage.toString())
//                            .setPositiveButton("确定", new DialogInterface.OnClickListener() {
//                                @Override
//                                public void onClick(DialogInterface dialog, int which) {
//                                    dialog.dismiss();
//                                }
//                            })
//                            .setCancelable(false)
//                            .show();
                } else {
                    Toast.makeText(mContext, "应用发生异常,即将退出", Toast.LENGTH_SHORT).show();
                }
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
//        collectDeviceInfo(mContext);
        // 保存日志文件
//        saveCrashInfo2File(ex);
        return true;
    }

    private Activity getTopActivity() {
        if (mActivities.size() > 0) {
            return mActivities.get(mActivities.size() - 1);
        }
        return null;
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (PackageManager.NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) {

        Log.e(TAG, "an error occured while writing file...", ex);

//        StringBuffer sb = new StringBuffer();
//        for (Map.Entry<String, String> entry : infos.entrySet()) {
//            String key = entry.getKey();
//            String value = entry.getValue();
//            sb.append(key + "=" + value + "\n");
//        }
//
//        Writer writer = new StringWriter();
//        PrintWriter printWriter = new PrintWriter(writer);
//        ex.printStackTrace(printWriter);
//        Throwable cause = ex.getCause();
//        while (cause != null) {
//            cause.printStackTrace(printWriter);
//            cause = cause.getCause();
//        }
//        printWriter.close();
//        String result = writer.toString();
//        sb.append(result);
//        try {
//            long timestamp = System.currentTimeMillis();
//            String time = formatter.format(new Date());
//            String fileName = "crash-" + time + "-" + timestamp + ".log";
//            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
//                String path = "/sdcard/crash/";
//                File dir = new File(path);
//                if (!dir.exists()) {
//                    dir.mkdirs();
//                }
//                FileOutputStream fos = new FileOutputStream(path + fileName);
//                fos.write(sb.toString().getBytes());
//                fos.close();
//            }
//            return fileName;
//        } catch (Exception e) {
//            Log.e(TAG, "an error occured while writing file...", e);
//        }
        return null;
    }
}
